The Hunter Mill District is one of nine magisterial districts in Fairfax County. It extends from the Dulles International Airport boundary in the west to Tyson's Corner in the east and includes the Reston area and the Town of Vienna. It encompasses 33.9 square miles with a population of 108,141 in 1998 (according to the latest Fairfax County estimate). By the year 2025, the district is estimated to grow to a population of over 150,000 (See the Fairfax County demographics page for further information).

Vienna is an incorporated town within Fairfax County and operates under a Council-Manager form of government. It was settled in the late 1700s. Reston was developed as one of the nation's first planned communities.

Reston was developed as one of the nation's first planned communities. The development of Lake Anne Village Center began in 1963 and the center is now a designated historic district. Most of the residents of Reston are members of the Reston Association which maintains the 1,300 acres of open space owned by the community, conducts environmental and recreation programs, and administers the covenants related to the design and maintenance of property in Reston.

The Hunter Mill District is home to many outstanding natural areas. Meadowlark Gardens, the Walker Nature Education Center,  Lake Fairfax Park,  Frying Pan Park , and several stream valley parks provide Hunter Mill District residents with ample opportunities to enjoy the outdoors. The W&OD Regional Park extends through the center of the District it is located on the former railroad line and is today a multi-use trail that extends from Purcellville, Virgina to Falls Church, Virginia.

Located in close proximity to Dulles Airport and Washington, D.C., the Hunter Mill District is home to a thriving business community including many innovative Internet businesses. Several government agencies are located here too. The U.S. Geological Survey was one of the first large employers to locate in the new town of Reston, allowing many of the first residents to live and work in Reston.